counterbore

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counterbore

[′kau̇nt·ər‚bȯr]
(design engineering)
A flat-bottom enlargement of the mouth of a cylindrical bore to enlarge a borehole and give it a flat bottom.
(engineering)
To enlarge a borehole by means of a counterbore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

counterbore

To enlarge a hole to receive the head of a bolt or a nut.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The anodized aluminum body has a built-in repairable air cylinder and a combination of mounting holes to facilitate rigid mounting in tight spaces: counterbored tapped through-holes on the bottom and tapped holes on the rear and side with a slip fit dowel hole and slot for precision alignment.
Before rough cutting the buttplate to size, it should be temporarily attached to the stock with counterbored screws.
With tile bolt closed, the chambered case bead is enclosed by the counterbored bolt face, the chamber wall of the barrel and the front of the upper receiver that surrounds the barrel shank--all of which are steel.
It's not a bad idea to have the conversion done, considering that the chambers are counterbored and it's deuced difficult to tell if the firing pin is resting on the rim of a cartridge.
Next, they counterbored the ID with a special custom-made drilling tool in two progressively larger drill head sizes up to 2.700" dia.
Drill the counterbored holes for the walnut plugs to cover the drywall screws that hold the cross support (B).
Eighteen such features are supplied in a standard library, including bosses, through holes, countersunk and counterbored holes, and pockets with straight sides or draft angles.
The bolt face is counterbored although its wall is interrupted for the passage of a Sako-style extractor.
Some would travel through vents on the sides of the receiver ring, both adjacent to the counterbored face of the bolt.
The grooved cylinder is counterbored to better support and encase the head of the rimfire cases.